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Read carefully this chapter. You will find a summary of the main migration theories and some criticism to the current state of the art.
Do you agree with the author that we should have one unifying theory of migration? What would be the pros and cons of going that way?
Write your opinion in your journal! and don't forget that you can also look what others' have written in their journal and give your comments.
Too many theories
I really don't think we need all these theories. People migrate for one reason: to try to get a better life. "Better" here might mean healthier, or freer from persecution, or more likely to get a better job, etc, etc, or a combination of all or any of these. The various theories are just different ways of expressing this basic truth.